In order to solve low reliability of mine ventilation system and high spontaneous combustion possibility problem which caused by air leakage in mine, the law of air leakage and control technology in coal mine was studied. Based on the analysis of the mine air leakage type and mine air leakage resistance law, the internal air leakage and external air leakage of effective control measures were put forward. The air door their existing problems were improved Zhang Jiagou Mine site application showed that the technology ensured the reliability of the ventilation system, reduced more than half of the lower leakage air volum